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test_astream_events_from_model() — langchain Function Reference

Architecture documentation for the test_astream_events_from_model() function in test_runnable_events_v1.py from the langchain codebase.

Function python LangChainCore Runnables calls 2

Entity Profile

Dependency Diagram

graph TD
  30efcf28_5850_b85b_5a4e_32dd66180dfa["test_astream_events_from_model()"]
  8ff41f3c_f250_f8de_8094_4f24860a10e0["test_runnable_events_v1.py"]
  30efcf28_5850_b85b_5a4e_32dd66180dfa -->|defined in| 8ff41f3c_f250_f8de_8094_4f24860a10e0
  aac0453e_34cd_4dce_c7fa_f176ab20140b["_collect_events()"]
  30efcf28_5850_b85b_5a4e_32dd66180dfa -->|calls| aac0453e_34cd_4dce_c7fa_f176ab20140b
  6ebe7fde_6e8f_dae5_d42f_9cea181617f5["_assert_events_equal_allow_superset_metadata()"]
  30efcf28_5850_b85b_5a4e_32dd66180dfa -->|calls| 6ebe7fde_6e8f_dae5_d42f_9cea181617f5
  style 30efcf28_5850_b85b_5a4e_32dd66180dfa fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

libs/core/tests/unit_tests/runnables/test_runnable_events_v1.py lines 474–815

async def test_astream_events_from_model() -> None:
    """Test the output of a model."""
    infinite_cycle = cycle([AIMessage(content="hello world!")])
    # When streaming GenericFakeChatModel breaks AIMessage into chunks based on spaces
    model = (
        GenericFakeChatModel(messages=infinite_cycle)
        .with_config(
            {
                "metadata": {"a": "b"},
                "tags": ["my_model"],
                "run_name": "my_model",
            }
        )
        .bind(stop="<stop_token>")
    )
    events = await _collect_events(model.astream_events("hello", version="v1"))
    _assert_events_equal_allow_superset_metadata(
        events,
        [
            {
                "data": {"input": "hello"},
                "event": "on_chat_model_start",
                "metadata": {"a": "b"},
                "name": "my_model",
                "run_id": "",
                "parent_ids": [],
                "tags": ["my_model"],
            },
            {
                "data": {
                    "chunk": _any_id_ai_message_chunk(
                        content="hello",
                    )
                },
                "event": "on_chat_model_stream",
                "metadata": {"a": "b"},
                "name": "my_model",
                "run_id": "",
                "parent_ids": [],
                "tags": ["my_model"],
            },
            {
                "data": {"chunk": _any_id_ai_message_chunk(content=" ")},
                "event": "on_chat_model_stream",
                "metadata": {"a": "b"},
                "name": "my_model",
                "run_id": "",
                "parent_ids": [],
                "tags": ["my_model"],
            },
            {
                "data": {
                    "chunk": _any_id_ai_message_chunk(
                        content="world!", chunk_position="last"
                    )
                },
                "event": "on_chat_model_stream",
                "metadata": {"a": "b"},
                "name": "my_model",
                "run_id": "",
                "parent_ids": [],
                "tags": ["my_model"],
            },
            {
                "data": {
                    "output": _any_id_ai_message_chunk(
                        content="hello world!", chunk_position="last"
                    )
                },
                "event": "on_chat_model_end",
                "metadata": {"a": "b"},
                "name": "my_model",
                "run_id": "",
                "parent_ids": [],
                "tags": ["my_model"],
            },
        ],
    )

    @RunnableLambda
    def i_dont_stream(value: Any, config: RunnableConfig) -> Any:

Domain

Subdomains

Defined In

Calls

Source

Frequently Asked Questions

What does test_astream_events_from_model() do?
test_astream_events_from_model() is a function in the langchain codebase, defined in libs/core/tests/unit_tests/runnables/test_runnable_events_v1.py.
Where is test_astream_events_from_model() defined?
test_astream_events_from_model() is defined in libs/core/tests/unit_tests/runnables/test_runnable_events_v1.py at line 474.
What does test_astream_events_from_model() call?
test_astream_events_from_model() calls 2 function(s): _assert_events_equal_allow_superset_metadata, _collect_events.

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